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Roles of photoperiod and testosterone in seasonal plasticity of the avian song control system

✍ Scribed by Smith, G. Troy ;Brenowitz, Eliot A. ;Wingfield, John C.

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 133 KB
Volume: 32
Category: Article
ISSN: 0022-3034
DOI: 10.1002/(sici)1097-4695(199704)32:4<426::aid-neu6>3.0.co;2-8

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✦ Synopsis

The song control nuclei of songsize of several song nuclei, regardless of photoperiod. birds undergo pronounced seasonal changes in size Photoperiod exerted small but significant steroid-inand neuronal attributes. The mechanisms by which dependent effects on the volume of the higher vocal seasonal changes in environmental variables such as center and the size of neurons in the robust nucleus photoperiod mediate seasonal changes in these brain of the archistriatum. Photoperiod also modulated the regions are not known. Manipulations of photoperiod effect of testosterone on the size of area X; testosterone and/or testosterone in captive songbirds induce seatreatment had a more pronounced effect on the size sonal changes in the size of song nuclei comparable of area X on short days than on long days. These to those observed in wild songbirds. It is unclear, howresults suggest that although testosterone is the priever, whether the effects of photoperiod on the song mary factor mediating seasonal changes in neural atnuclei are mediated by testosterone or by steroid-indetributes of the song nuclei, photoperiod may act via pendent mechanisms. We independently manipulated mechanisms that are independent of steroid levels to photoperiod and testosterone in castrated male Gamsupplement or modulate the actions of testosterone. bel's white-crowned sparrows (Zonotrichia leucophrys

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